Variable geometric outlet vane

Abstract

The invention discloses a variable geometry outlet guide vane, the outlet guide vane includes an inlet adjustable section, an outlet fixed section, and there is a gap between the trailing edge of the inlet adjustable section and the front edge of the outlet fixed section; the gap is formed by Composed of two smooth curves, the pressure surface and the suction surface are connected through the gap. Using the pressure difference between the pressure surface and the suction surface, a small part of the air flows through the gap from the concave surface to the convex surface, so as to blow the boundary layer and reduce the loss. Increase the airflow turning angle. The variable geometry outlet guide vane of the compressor proposed by the present invention, by adjusting the position of the front part of the outlet guide vane, avoids flow separation or blockage due to the excessive The rear part of the guide vane remains stationary, and the rotation of the guide vane has little effect on the flow of the exhaust diffuser and the combustion chamber.

Description

technical field [0001] The invention belongs to the technical field of impeller machinery equipment, and relates to a compressor, in particular to a variable geometry outlet guide vane of the compressor. Background technique [0002] When the compressor operates under the design conditions, the fluid can be better attached to the airfoil, and no large separation will occur. However, when the compressor is running at a small flow rate, the inlet of the guide vane will have a large positive angle of attack, and the airflow will separate at the back arc of the blade shape. The separation zone will develop rapidly and severely with the increase of the angle of attack, eventually leading to the flow of the compressor. Stall; when the compressor is running at a large flow rate, a large negative angle of attack will appear at the inlet of the guide vane. When the negative angle of attack reaches a certain level, it will easily cause blockage of the blade passage and reduce the flow...

AI Technical Summary

Problems solved by technology

But for the outlet guide vane, it is necessary to consider the requirements of the combustion chamber and the exhaust diffuser section on the outlet airflow angle of the guide vane. If the outlet guide vane rotates as a whole, when the adjustment amount is too large, the outlet airflow angle of the guide vane will decrease. A large deviation from the design condition will adversely affect the flow of the exhaust diffuser and the combustion chamber. Therefore, it is best to design a segmented outlet guide vane, which can adjust the front section of the outlet guide vane and fix the rear section.

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